Yes, most of FIRE & BLOOD consists of the ‘sidebars’ I originally wrote for THE WORLD OF ICE & FIRE. Abridged versions of some of those pieces appeared as “The Princess and the Queen,” “The Rogue Prince,” and “The Sons of the Dragon,” but these are the full versions, together with some chapters that have never appeared anywhere…F&B will be in two volumes. Vol 1 before [The Winds Of Winter], vol 2 after.

Par for the course. I’ve had to exercise patience and understanding with GRRM since I started reading these books 13, 14 years ago. Those books are fucking deep and complex, so I’m more understanding now than I was as a teenager.

I suppose this discussion is new, but GRRM came out and said Fire&Blood is next, and that if things work out right, there might just be 2 books in ’18 (referring to WoW). He’s on record saying this at least 6 months ago.
He also wants to finish Dunk&Egg. That’s why there’s no show about it in the plans, bc he doesn’t want another GoT situation